sure
hold good
ultrasecure
sound
assured
well-fixed
hold the fort
copper-bottomed
healthy
safeguardable
safe as houses
safely
fastly
trig
snugly
certifiable
securable
batten down
retain
firmness
high speed, low drag
steadiness
bulletproof
irrelapsable
supersafe
semireliable
anchor
firm
oversecure
reliableness
clinch
douth
indemnify
risk-free
snug
hazardproof
foothold
SSC
go-to
without accident
unthreatened
refuge
preserved
unhazarded
nonresistant
sustainable
undangerousness
unfast
firmly
trusty
shieldable
solid as a rock
ballast
spyproof
maintain
unassailable
trust
unimperiled
bomber
conserve
keep up
preserve
chain
protectability
secure
secureness
unsteadiness
cast iron
ricketiness
certain
riskless
bulletproofness
safe
fast
immune
unbreakable
trusted
safety net
good old
maintainable
conservative
protectable
reliability
ineradicability
semiprotective
protectiveness
unclogged
cybersecure
cyberresilient
protected
strategyproofness
assure
chevy

English words for 'Physically secure and certain, non-failing, reliable.'

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